Description
Product Description:
CORKJOINT JOINTFLEX Closed Cell Polyethylene Fillerboard is a closed cell, crossed linked, non-absorbent polyethylene expansion joint fillerboard for use in expansion and isolation joints in concrete and masonry structures. Jointflex is non-absorbent and has excellent properties allowing it to be used in water retaining and excluding structures where potable, salt, chlorine and sewerage water is present.
Jointflex has no bitumen content and joint sealant can be directly applied on top of it without the use of a bond-breaker tape. Jointflex is available in standard 50kg/m³ (low) density and is also available in custom densities of 100kg/m³ (medium) and 150kg/m³ (high).
Supplied in sheet form and at a thickness to suit the joint width or can be custom cut in sheet sizes to suit the concrete thickness or width. Also available upon request with a tear-off cap to suit the joint sealant application depth.
Features
- Dimension: 2m (L) x 1m (W) x 25mm (T).
- Density: 50 kg/m³.
- Colour: Black.
Advantages
- Non-absorbent.
- Lightweight.
- Excellent weatherability .
- Resistant to ultraviolet light.
- No-bitumen content.
- Ability to compress and recover.
- Non extruding from joint movement.
- Suitable for submerged or trafficable joints.
Area of Application
| AREA OF APPLICATION | |
| Slab on ground | Suspended slabs |
| Brickwork and blockwork | Basements and tunnels |
| Reinforced concrete structures | Water retaining and excluding structures |
| Concrete roads & pavements | Dams & reservoirs |
Available Sizes
- Available in sheet size 2m x 1m..
- Available in thickness of 10, 12, 15, 20 and 25mm. Sizes from 2-50mm are cut to order..
- Available in low density (50kg/m³), medium density (100kg/m³) and in high density (150kg/m³)..
Physical Properties
| PROPERTY | METHOD | UNIT | RESULT |
| Density | ISO 845 | Kg/m³ | 50 |
| Tensile Strength | ISO 1798 | MPa | 0.44 |
| Elongation at break | ISO 1798 | % | 100 |
| Compression stress strain at deflection 10% | ISO 3386 | KPa | 34 |
| Compression stress strain at deflection 25% | ISO 3386 | KPa | 59 |
| Compression stress strain at deflection 50% | ISO 3386 | KPa | 125 |
| Tear Strength | DIN 53507 | N/nm | 1.0 |
| Compression set (22n, 25%, 25°C) after 0.5h | ISO 1856 | % | <14 |
| compression release:- 24h | ISO 1856 | % | <6 |
| Water absorption after 28 days | DIN 53433 | Vol% | <3 |
Typical Applications
Written Specification
Where shown in the drawings, the expansion joint fillerboard shall be Jointflex, closed cell / cross-linked polyethylene fillerbard material, with a minimum density of 50kg/m³, as supplied by CORKJOINT. The application / installation of the product must be in accordance with the manufacturer’s recommendations.

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